Method and structure for identifying and judging oil injection quantity of compressor

Abstract

The invention discloses a recognition and judgment method and recognition structure for the oil injection amount of a compressor, and the method comprises the steps: obtaining the oil storage amount at the bottom of a lower shell of the compressor, and recording the oil storage amount as V1; obtaining the oil quantity contained in each kinematic pair of a pump body in the compressor and a motor stator coil, and recording the oil quantity as V2; the quantity of oil discharged into the refrigeration cycle system by the compressor is obtained and recorded as V3; the total oil injection amount of the compressor is V, and V = V1 + V2 + V3. According to the method for identifying and judging the oil injection amount of the compressor, the oil injection amount can be accurately judged, the oil consumption problem of each part and each link in the operation process of the compressor is fully considered, the oil amount of each part can be accurately controlled, the sufficient lubrication requirement of the compressor is met, and the oil consumption is reduced. The optimal filling amount of the refrigerating machine oil of the compressor is determined through the method, and the operation reliability of the compressor and the economical efficiency of oil filling are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressor production, and in particular to a method and structure for identifying and judging the oil injection amount of a compressor. Background Art

[0002] At present, during the production process of reciprocating piston compressors, there are often abnormalities such as difficulty in starting the compressor or excessive shell temperature or even machine tripping. In addition, during the operation of the compressor, customers sometimes report abnormal mechanical sounds and the compressor's low-temperature time becomes significantly longer. After checking the compressor and checking the parts accuracy, assembly clearance and motor overload capacity, no faults such as parts accuracy, assembly clearance and motor were found. Finally, after analysis, it was found that the compressor refrigeration oil was insufficient. The compressor refrigeration oil plays a role in cooling and lubrication during the operation of the machine. As a result, the compressor refrigeration oil is insufficient, resulting in poor cooling and lubrication. The compressor has problems such as difficulty in starting, high shell temperature, and even tripping; and sometimes customers report abnormal mechanical sounds, and the compressor has significantly longer low-temperature time. There is no problem with the precision assembly clearance of parts. Finally, it is found that the compressor has too much refrigeration oil, which causes the motor rotor to contact the oil and mechanical oil stirring sound. At the same time, due to the large amount of oil filling, part of the oil is discharged to the customer's refrigeration system through the exhaust pipe, which not only occupies the heat exchange area, but also because the refrigerant dissolved in the oil increases, the mass flow of the refrigerant participating in the evaporation process decreases, affecting the heat exchange and cooling capacity, causing the customer's low-temperature time to be significantly longer. Sometimes, due to the failure of the oil filling equipment at the production site, the amount of refrigeration oil filling is too little or too much, resulting in similar problems with customers.

[0003] In addition, there are also cases where the compressor has been filled with the correct amount of oil, but shortly after the compressor was put on the market, customers have reported that the compressor is difficult to start, and even has low cooling capacity and significantly increased power consumption. The compressor shell was dissected and analyzed, and the compressor's moving parts were scratched or burred, and even high-temperature carbon deposits appeared in the valve group. Through strengthening the control of parts precision and assembly process requirements, customers still reported abnormalities such as difficulty in starting and low cooling capacity after using it for a period of time. After further investigation, it was found that the compressor was poorly lubricated and had leakage risks due to high temperature. The reason for the high temperature is that the refrigeration oil bubbles when the compressor is working. The bubbles of a certain volume will make the refrigeration oil not evenly distributed on the surface of the friction pair of the compressor movement. Some friction pair surfaces will have no refrigeration oil, resulting in insufficient lubrication of some areas of the friction pair surface, thereby increasing the wear and seizure risks between moving parts. When the crankshaft, piston, connecting rod and other key components are not well lubricated when the refrigeration oil bubbles, excessive wear will occur, shortening the service life of the compressor. At the same time, due to the increase in friction heat, insufficient lubrication will occur, and the heat generated by friction cannot be taken away by the refrigeration oil, resulting in local temperature increase. Further reducing the performance of the refrigeration oil, and causing serious faults such as compressor jamming. Bubbles in the refrigeration oil may cause air gaps in the sealing parts such as the matching gap, reducing the sealing effect. Poor oil sealing will cause refrigerant leakage and reduce the efficiency of the refrigeration system. Summary of the invention

[0004] The purpose of the present invention is to provide a method and structure for identifying the oil injection amount of a compressor in view of the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A method for identifying and judging the oil injection amount of a compressor, the method comprising the following steps: Obtain the oil volume at the bottom of the compressor lower shell, recorded as V1; Obtain the amount of oil contained in each moving pair of the pump body in the compressor and the stator winding of the motor, recorded as V2; Obtain the amount of oil discharged from the compressor into the refrigeration cycle system, recorded as V3; The total oil injection volume of the compressor is V, then V=V1+V2+V3.

[0006] Since the refrigerant and the refrigeration oil are completely miscible, when the compressor is working, part of the refrigerant will be brought into the system, and part of the oil will infiltrate the compressor moving parts including the motor. Through experiments, the three parts of the working oil volume of the compressor in the refrigeration cycle system when the compressor is working are determined. After the compressor has been running in the refrigeration cycle system for a period of time, the refrigeration oil will be adsorbed on the surface of the moving parts of the pump body, the motor stator coil, and the two devices of the refrigeration system. Part of the oil cannot return to the compressor. After the compressor stops, the method can identify the depth of the oil in the suction pipe, and through the relationship between the filling amount and the depth of the oil in the suction pipe, the optimal filling amount and the position of the optimal filling amount scale line are established. If the refrigeration oil is filled too much, the refrigeration oil will enter the evaporator and condenser, occupy the heat exchange channel, and reduce the thermal efficiency. At the same time, more refrigeration oil will dissolve more refrigerant, further reducing the refrigerant involved in the refrigeration cycle, and also eliminating the unnecessary influence of excessive filling of refrigeration oil on the refrigeration capacity.

[0007] Furthermore, the method for obtaining the oil storage volume V1 is as follows: making a visualized lower housing assembly, installing the pump body and the motor in the lower housing assembly, and keeping the pump body horizontal; Pour the refrigeration oil into the lower housing assembly, and observe the oil level and the depth of the oil suction pipe of the crankshaft in the pump body until the oil level has penetrated 1 / 2 to 2 / 3 of the lower winding package of the motor stator; Pick up the pump body and observe whether the lower end ring of the rotor on the pump body is stained with oil, and ensure that there is no oil stain on the lower end ring of the rotor. Record the amount of oil poured in. The amount of oil at this time is the oil storage volume V1 at the bottom of the lower shell.

[0008] Furthermore, the lower shell component is made of transparent tempered glass, or the lower shell component is made according to the following method: A compressor lower shell is selected, and cut downward from the stop plane of the lower shell, cutting off 2 / 3 to 3 / 4 to form a lower shell cutting assembly with a height of 1 / 4 to 1 / 3 of the original lower shell height.

[0009] Furthermore, the method for obtaining the oil volume V2 is as follows: making a visualized upper housing assembly and a lower housing assembly, installing a pump body and a motor in the upper housing assembly and the lower housing assembly according to assembly requirements, and obtaining an assembled compressor; Fill the compressor with oil through the process pipe on the lower housing assembly, and observe the oil level in real time until the oil level is 2 / 3 to 3 / 4 of the height of the lower stator winding of the motor. Pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface. Record the amount of oil added to the compressor V A ; The process pipe is blocked, the air intake pipe on the lower shell assembly is connected to the ventilation hose, the air exhaust pipe is connected to the oil introduction pipe, and the oil introduction pipe is connected to the measuring cylinder; Power on the compressor, introduce dry air or nitrogen from the suction pipe, and record the volume V of the oil in the measuring cylinder after a period of testing. b At the same time, let the compressor stand for 6 to 10 minutes after power-on, and pour out the remaining oil V in the compressor. c , then the oil volume V2=V A -V b -V c .

[0010] Furthermore, the method for obtaining the oil volume V3 is as follows: making a visualized upper housing assembly and a lower housing assembly, installing a pump body and a motor in the upper housing assembly and the lower housing assembly according to assembly requirements, and obtaining an assembled compressor; Fill the compressor with oil through the process pipe on the lower housing assembly, and observe the oil level in real time until the oil level is 2 / 3 to 3 / 4 of the height of the lower stator winding of the motor. Pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface. Record the amount of oil added to the compressor V A ; Connecting the compressor to a refrigeration cycle system, wherein the refrigeration cycle system is provided with an oil separator and an oil storage tank; The compressor is evacuated and filled with an appropriate amount of refrigerant. The compressor is powered on and the refrigeration system is allowed to run stably for several hours. After the operation is completed, the oil in the oil separator is poured into a measuring cylinder and the oil volume V in the oil separator is recorded. d ; Get the oil volume V in the oil reservoir e , then the oil volume V3=V d +V e .

[0011] Furthermore, the oil volume V in the oil reservoir is e The method for obtaining is as follows: open the stop valve on the oil reservoir, use nitrogen to blow the oil remaining at the high-pressure end of the refrigeration cycle system into the oil reservoir; heat it at 40-50°C for several minutes, and after heating, record the oil volume V in the oil reservoir. e .

[0012] Furthermore, the refrigeration cycle system includes a compressor, a first oil separator, a condenser, a filter, a throttling device, an evaporator and a second oil separator connected in sequence; a first oil reservoir with a shut-off valve is provided between the first oil separator and the condenser, and a second oil reservoir with a shut-off valve is provided between the second oil separator and the evaporator; a first charging valve is provided between the filter and the condenser, and a second charging valve is provided between the throttling device and the evaporator.

[0013] Furthermore, after the compressor is connected to the refrigeration cycle system, and the refrigeration cycle system is placed in a constant temperature environment, the compressor is evacuated. After the evacuation is completed, the compressor is filled with an appropriate amount of refrigerant, the compressor is powered on and operated, and the crankshaft oil stirring in the pump body is observed; if bubbles continue to emerge from the oil surface, and the bubbles do not disappear or even the volume of the bubbles increases, it means that the anti-foaming performance of the compressor oil is unqualified, and the compressor is at risk of lubrication difficulties and poor sealing; if no bubbles appear or the bubble volume is small, and the bubbles burst after bubbling, it means that the anti-foaming performance of the compressor is qualified, the oil filling amount of the compressor is also qualified, and the lubrication and sealing requirements of the compressor are met.

[0014] When the compressor is working, if the oil has poor anti-foaming performance after the crankshaft is stirred, a certain volume of bubbles will prevent the refrigeration oil from being evenly distributed on the moving friction surface of the compressor. Some friction surfaces will not have refrigeration oil, resulting in insufficient lubrication of some areas of the friction surface, thereby increasing the risk of wear and jamming between moving parts; when the crankshaft, piston, connecting rod and other key components are not well lubricated when the refrigeration oil foams, excessive wear will occur, shortening the service life of the compressor; at the same time, due to the intensification of friction heat, insufficient lubrication will occur, and the heat generated by friction cannot be taken away by the refrigeration oil, resulting in local temperature rise, further reducing the performance of the refrigeration oil, and causing serious faults such as compressor jamming; refrigeration oil bubbles may also produce air gaps in sealing parts such as matching clearances, reducing the sealing effect. Poor oil seals will lead to refrigerant leakage and reduce the efficiency of the refrigeration system. The above method can clearly show the working status of the oil when the compressor is working. Once bubbles appear, the size of the bubbles can be accurately identified through the scale line, and whether the foaming performance is qualified can be determined. If the bubble volume becomes larger and does not break, it indicates that the anti-foaming property of the refrigeration oil is unqualified and an anti-foaming agent needs to be added. The refrigeration oil with the added anti-foaming agent can be verified again through the device and method, which greatly improves the reliability of the compressor.

[0015] A compressor oil filling amount identification structure, a visualization part is set on the compressor housing, a pump body and a motor are arranged in the compressor housing, an oil suction pipe is arranged at the lower end of the crankshaft in the pump body, and the oil suction pipe is connected to the refrigeration oil. The visualization part can observe the depth of the oil suction pipe inserted into the refrigeration oil and the oil level.

[0016] Furthermore, the compressor housing includes an upper housing assembly and a lower housing assembly assembled together, the visualization portion is a transparent glass arranged on the lower half of the lower housing assembly, or the upper housing assembly and the lower housing assembly are both made of transparent materials; and a scale mark is also provided on the visualization portion.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the setting of the visualization part, the oil amount in the compressor housing and the depth of the crankshaft oil suction pipe inserted into the refrigeration oil can be observed intuitively and accurately, so as to identify the refrigeration oil filling amount and oil suction situation, which is convenient for the staff to find the refrigeration oil problem in time and is conducive to the oil filling amount identification test; 2. The identification and judgment method of the compressor oil filling amount can accurately judge the oil filling amount, fully considering the oil consumption problem of each part and each link in the operation process of the compressor, and can make the oil amount of each part accurately controllable, which not only meets the full lubrication requirement of the compressor, but also through this method. Establish the optimal filling amount of compressor refrigeration oil, greatly improve the reliability of compressor operation and the economy of oil filling; 3. Through this method, it can identify abnormalities such as difficulty in starting the compressor due to lack of oil, excessive shell temperature or even tripping of the compressor, and can identify abnormalities such as abnormal mechanical dry friction sound between parts and poor motor cooling effect resulting in increased power due to lack of oil or lack of oil in the compressor. At the same time, the compressor has less oil, the shell temperature and pump body temperature become significantly higher, and the high temperature pump body heats the refrigerant, increases the suction specific volume, and reduces the suction volume. Through this method, it can avoid abnormalities such as significantly longer low-temperature time of the compressor due to lack of oil, which increases power consumption, and greatly reduces the compressor caused by lack of oil. Cooling and lubrication are not good, the compressor has various abnormalities such as difficulty in starting, high shell temperature, and even tripping and increased power consumption; at the same time, once the compressor oil is found to be low, the correct amount of oil can be added in time through this structure to further improve the stability and reliability of the compressor during operation; 4. Through this method, the oil content of the pump body with different cooling capacity can be obtained, which is generally around 40~50ml, and the different circulating oil volume ratios of the total oil volume can also be obtained. Under normal circumstances, the circulating oil volume accounts for 14.4%~15.7% of the total oil volume; if the V3 is filled with a large amount of oil, it is calculated that when the circulating oil volume of the refrigeration oil exceeds 15.7%, the circulating oil volume can be retested to establish the circulating oil volume The circulating oil volume is returned to 14.4%~15.7% of the total oil volume, or when the filling volume is too high, the oil entry depth of the oil suction pipe exceeds the optimal filling volume scale line position, and the oil volume is returned to the optimal filling volume scale line position by continuously pouring out the oil; 5. The working status of the oil product when the compressor is working can be clearly seen through this method. Once bubbles appear, the volume of the bubble can be accurately identified through the scale line, and it can be determined whether the foaming performance is qualified. If the volume of the bubble becomes larger and does not break, it indicates that the anti-foaming property of the refrigeration oil is unqualified, and an anti-foaming agent needs to be added. The refrigeration oil with the added anti-foaming agent can be verified again through the device and method, which greatly improves the reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure diagram of the compressor visualized by the present invention is shown in FIG. Figure 1 ; Figure 2 The structure diagram of the compressor visualized by the present invention is shown in FIG. Figure 2 ; Figure 3 It is a structural schematic diagram of the bottom of the lower shell of the compressor of the present invention; Figure 4 Schematic diagram of the interior of a compressor (cut lower housing assembly) for visualization of the present invention Figure 1 ; Figure 5 Schematic diagram of the interior of a compressor (cut lower housing assembly) for visualization of the present invention Figure 2 ; Figure 6 This is a schematic diagram of the compressor of the present invention being connected to a refrigeration cycle system; Figure 7 Another structural schematic diagram of a visualized compressor of the present invention; Figure 8 for Figure 7 A schematic diagram of the structure of the lower shell of the compressor; Fig. 9 It is a schematic diagram of another lower shell structure of a visualized compressor of the present invention; Fig.10 for Fig. 9 A schematic diagram of the cross-sectional structure of the lower shell of the compressor; In the figure: 1. compressor; 2. upper shell assembly; 3. lower shell assembly; 301. lower shell cutting assembly; 4. cylinder seat; 5. cylinder head assembly; 6. connecting rod; 7. crankshaft; 8. motor; 801. motor stator lower wire package; 9. compression spring; 10. process pipe; 11. suction pipe; 12. exhaust pipe; 13. oil guide pipe; 14. blowing pipe; 15. power cord; 16. sealed inflation joint; 17. refrigeration oil; 18. scale Identification; 19, sealing joint; 20, charging pipe; 21, supporting pin; 22, oil suction pipe; 23, first oil separator; 24, first oil storage container; 25, condenser; 26, filter; 27, throttling device; 28, evaporator; 29, second oil storage container; 30, second oil separator; 31, stop valve; 32, first charging valve; 33, second charging valve; 34, transparent glass; 35, window; 36, positioning extension. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] Combination Figure 1 to Figure 5 As shown, the basic structure of the compressor is as follows: it includes an upper housing assembly 2 and a lower housing assembly 3, the pump body includes a cylinder seat 4, a crankshaft 7, a connecting rod 6, a piston and a cylinder head assembly 5, etc. The cylinder seat 4 is provided with a crankshaft 7 on the shaft hole, and an oil suction pipe 22 is provided at the lower end of the crankshaft 7. A piston is installed on the cylinder hole of the cylinder seat 4, and a piston pin hole is provided on the piston. The piston is installed in the piston pin hole. The small hole of the connecting rod 6 is connected with the piston pin, and the large hole of the connecting rod 6 is connected with the eccentric shaft of the crankshaft 7; a motor is installed on the long axis of the crankshaft 7, and the motor rotor is sleeved on the crankshaft 7. The stator of the motor is installed on the stator surface of the cylinder seat 4 and forms an installation gap with the rotor of the motor; a support pin 21 is provided in the lower housing assembly 3, and the pump body is connected to the support pin 21 through a compression spring 9. The outer periphery of the lower housing assembly is also connected to a process pipe 10, an exhaust pipe 12 and an intake pipe 11.

[0022] A method for identifying and judging the oil injection amount of a compressor, the method comprising the following steps: Obtain the oil volume at the bottom of the compressor lower shell, recorded as V1; Obtain the amount of oil contained in each moving pair of the pump body in the compressor and the motor stator winding package (the motor stator winding package generally includes the upper winding package, the lower winding package and the internal coil, etc.), recorded as V2; Obtain the amount of oil discharged from the compressor into the refrigeration cycle system, recorded as V3; The total oil injection volume of the compressor is V, then V=V1+V2+V3.

[0023] The compressor oil filling amount identification and judgment method can accurately judge the oil filling amount, fully considers the oil usage of various parts and links of the compressor during operation, and can make the oil amount of each part accurately controllable, which not only meets the full lubrication requirements of the compressor, but also establishes the optimal filling amount of the compressor refrigeration oil through this method, greatly improving the operating reliability of the compressor and the economy of oil filling.

[0024] Furthermore, the method for obtaining the oil storage amount V1 is as follows: a visual lower housing assembly 3 is made, the pump body and the motor are installed in the lower housing assembly 3, the pump body is kept horizontal, and the oil suction pipe of the crankshaft in the pump body and the lower winding package of the motor stator can be observed through the visual lower housing assembly 3; Pour the refrigeration oil directly into the lower housing assembly 3, and observe the oil level and the depth of the oil suction pipe 22 of the crankshaft 7 in the pump body until the oil level has penetrated 1 / 2 to 2 / 3 of the lower winding package 801 of the motor stator; Gently pick up the pump body and observe whether the lower end ring of the rotor on the pump body is stained with oil, and ensure that there is no oil stain on the lower end ring of the rotor. Use a measuring cylinder to record the amount of oil poured in. The amount of oil at this time can be approximated as the oil storage volume V1 at the bottom of the lower shell.

[0025] Furthermore, the lower housing component 3 is made of transparent tempered glass, or the lower housing component 3 is made according to the following method: Select a compressor lower shell, cut downward from the stop plane of the lower shell, cut off 2 / 3 to 3 / 4 and form a lower shell cutting assembly 301 with a height of 1 / 4 to 1 / 3 of the original lower shell height, so that an open compressor lower shell with oil storage at the bottom can be obtained, and the situation of refrigeration oil pouring into it can be observed. In order to visually see the oil suction pipe and the motor lower wire package entering the oil. Further, the stator lower wire package is completely removed (such as Figure 5 As shown in the figure), it is more clear to test the oil entry depth of the oil suction pipe and the distance between the lower end ring of the rotor and the oil level of the refrigerator.

[0026] Furthermore, the method for obtaining the oil volume V2 is as follows: make a visual upper shell assembly 2 and a lower shell assembly 3 (which can be made of transparent tempered glass), install the pump body and the motor in the upper shell assembly 2 and the lower shell assembly 3 according to the assembly requirements, and other required parts will also be assembled together to obtain an assembled compressor 1. That is to say, this compressor 1 is basically the same as a normal compressor except that the shell is transparent, so that the actual oil volume of the compressor can be more accurately reflected.

[0027] Fill the compressor with oil through the process pipe 10 on the lower housing assembly 3, and observe the oil level in real time through the transparent tempered glass until the oil level is 2 / 3 to 3 / 4 of the height of the lower winding package of the motor stator. Gently pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface, and record the amount of oil V added to the compressor A .

[0028] The process pipe 10 is sealed with a sealed inflation joint 16, the air intake pipe 11 on the lower shell assembly is connected to the ventilation hose, the exhaust pipe 12 is connected to the oil introduction pipe 13, and the oil introduction pipe 13 is connected to the measuring cylinder; and the starter and protector are connected to the compressor sealing terminal, and the power cord 15 is connected to the protector and starter plug.

[0029] Power on the compressor, and introduce dry air or nitrogen from the suction pipe 11. The pressure of the introduced gas is 0.04-0.08 MPa (pressure gauge display). Power on for 2.5 hours, and record the volume V of the oil in the measuring cylinder after 2.5 hours of testing. b At the same time, let the compressor stand for 6 to 10 minutes after power-on, and pour out the remaining oil V in the compressor. c , then the oil volume V2=V of each moving pair of the pump body, such as the clearance between the piston and the cylinder hole, the clearance between the connecting rod and the large and small holes, and the motor stator coil. A -V b -V c .

[0030] Furthermore, the method for obtaining the oil volume V3 is as follows: a visualized upper housing assembly 2 and a lower housing assembly 3 are manufactured, and a pump body and a motor are installed in the upper housing assembly and the lower housing assembly according to assembly requirements to obtain an assembled compressor. This step is basically the same as the above-mentioned manufacturing method; Fill the compressor with oil through the process pipe 10 on the lower housing assembly 3, and observe the oil level in real time until the oil level is 2 / 3 to 3 / 4 of the height of the lower winding package of the motor stator. Pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface. Record the amount of oil V added to the compressor. A ; The compressor 1 is connected to a refrigeration cycle system, wherein the refrigeration cycle system is provided with an oil separator and an oil storage tank; The compressor is evacuated and filled with an appropriate amount of refrigerant. The compressor is powered on and the refrigeration system is allowed to run stably for several hours. After the operation is completed, the oil in the oil separator is poured into a measuring cylinder and the oil volume V in the oil separator is recorded. d ; Get the oil volume V in the oil reservoir e , then the oil volume V3=V d +V e .

[0031] Combination Figure 6As shown, the refrigeration cycle system includes a compressor 1, a first oil separator 23, a condenser 25, a filter 26, a throttling device 27, an evaporator 28 and a second oil separator 30 which are connected in sequence; a first oil reservoir 24 with a shut-off valve is provided between the first oil separator 23 and the condenser 25, and a second oil reservoir 29 with a shut-off valve is provided between the second oil separator 30 and the evaporator 28; a first air charging valve 32 is provided between the filter 26 and the condenser 25, and a second air charging valve 33 is provided between the throttling device 27 and the evaporator 28.

[0032] Specifically, the first oil separator 23 is connected to the exhaust pipe of the compressor 1 at a distance of 30 cm, and the second oil separator 30 is connected to the intake pipe of the compressor at a distance of 20 cm. A first oil reservoir 24 is provided at the front end of the first oil separator 23, and a stop valve 31 is provided on the first oil reservoir 24. A first charging valve 32 is provided at the end of the condenser 25 at a distance of 20 cm from the end of the condenser. The first charging valve is located between the filter and the condenser and is connected by threads. A second oil separator 30 is provided at the end of the evaporator 28 at a distance of 20 cm from the end of the evaporator. A second oil reservoir 29 is provided in front of the second oil separator 30, and a stop valve 31 is also provided on the second oil reservoir 29. A second charging valve 33 is provided at the end of the throttling device 27 (such as a capillary tube) at a distance of 10 cm from the end of the throttling device. The second charging valve 33 is located between the throttling device 27 and the evaporator 28 and is connected by threads.

[0033] The compressor is evacuated and filled with a proper amount of refrigerant such as R600a. After the compressor 1 is evacuated, the compressor is powered on and operated. The first charging valve 32 and the second charging valve 33 are opened, and the two stop valves 31 are closed. The refrigeration cycle system is allowed to operate stably for 3 to 3.5 hours. After the test, the oil in the first oil separator 23 and the second oil separator 30 is poured into a measuring cylinder, and the total oil volume V of the two oil separators is recorded. d ; Unscrew the thread at one end of the first charging valve 32, open the stop valve on the first oil reservoir 24, connect 0.8-1.0 MPa nitrogen from the unscrewed end of the first charging valve 32, and use the high pressure of the nitrogen to blow the remaining oil at the high-pressure end of the refrigeration cycle system into the first oil reservoir 24; unscrew the thread at one end of the second charging valve 33, open the stop valve on the second oil reservoir 29, connect 0.8-1.0 MPa nitrogen from the unscrewed end of the second charging valve 33, and use the high pressure of the nitrogen to blow the remaining oil at the low-pressure end of the refrigeration system into the second oil reservoir 29, and mix the oils in the first oil reservoir 24 and the second oil reservoir 29, heat them at 40-50°C for 5 minutes, and after heating, use a high-precision small measuring cylinder to record the total oil volume V of the first oil reservoir 24 and the second oil reservoir 29. e; Then the amount of oil discharged from the compressor to the refrigeration cycle system V3 = V d +V e In this way, the amount of oil introduced into the refrigeration cycle system can be obtained relatively accurately.

[0034] Furthermore, after the compressor is connected to the refrigeration cycle system, and the refrigeration cycle system is placed in a constant temperature environment of 24°C, the compressor is evacuated. After the evacuation is completed, the compressor is filled with an appropriate amount of refrigerant, the compressor is powered on and operated, and the crankshaft oil stirring in the pump body is observed; if bubbles continue to emerge from the oil surface, and the bubbles do not disappear or even the volume of the bubbles increases, it means that the anti-foaming performance of the compressor oil is unqualified, and the compressor is at risk of lubrication difficulty and poor sealing; if no bubbles appear or the bubble volume is small, and the bubbles burst after bubbling, it means that the anti-foaming performance of the compressor is qualified, the oil filling amount of the compressor is also qualified, and the lubrication and sealing requirements of the compressor are met.

[0035] Specifically, there is a blowing hole at the bottom of the lower shell component 2 of the fully transparent tempered glass, and the blowing hole is connected to the blowing pipe 14 (such as Figure 2 As shown), the process pipe 10 and the air intake pipe 11 of the compressor are connected to the sealed air charging joint 16, and the exhaust pipe 12 is connected to the sealed joint 19. The sealed air charging joint of the air intake pipe 11 is connected to the external exhaust pipe, and the compressor is placed in a constant temperature environment of 24°C for 2 hours. After 2 hours of constant temperature, dry air is blown into the air blowing pipe 14 for 5 minutes. The air flow rate is 70-80ml / min. It is observed that the foaming volume is quantified by the scale line for 5 minutes. After stabilization for 10 minutes, the foaming amount is observed again. At this time, there are no bubbles, indicating that the foaming amount of the refrigeration oil at 24°C is qualified; then the compressor is placed In a constant temperature state of 94°C (it can also be placed in a constant temperature water-soluble environment), blow dry air from the blowing pipe 14 for 5 minutes, the air flow rate is 70-80ml / min, and the foaming volume is observed after stagnating for 5 minutes. The foaming height is quantified through the scale line to obtain the foam volume. If the foam volume is ≤30ml or less, observe the foaming volume through the scale line after stabilization for 10 minutes. At this time, there are no bubbles or the bubbles have disappeared, indicating that the foaming amount of the refrigeration oil at 94°C is qualified, indicating that the anti-foaming performance of the compressor refrigeration oil is qualified, and the compressor not only has qualified oil volume, but also can meet the lubrication and sealing requirements of the compressor. Otherwise, it indicates that the anti-foaming performance of the compressor oil is unqualified, and the compressor is at risk of difficulty in lubrication and poor sealing; if there are no bubbles or the bubble volume is very small, and the bubbles burst after foaming, it means that the anti-foaming performance of the compressor is qualified, as shown in Table 1 below: Table 1: Compressor oil foaming test table

[0036] Another aspect of the present invention also provides a compressor oil filling amount identification structure, wherein a visualization part is arranged on the compressor housing, a pump body and a motor are arranged in the compressor housing, an oil suction pipe is arranged at the lower end of the crankshaft in the pump body, and the oil suction pipe is connected to the refrigeration oil. The visualization part can observe the depth of the oil suction pipe inserted into the refrigeration oil and the oil level height.

[0037] Through the setting of the visualization part, the oil amount in the compressor housing and the depth of the crankshaft oil suction pipe inserted into the refrigeration oil can be observed intuitively and accurately, so as to identify the refrigeration oil filling amount and oil suction situation, which is convenient for staff to discover refrigeration oil problems in time and is conducive to the implementation of oil filling amount identification test.

[0038] In some embodiments, Figure 7 and Figure 8 As shown, the visualization part is a window 35 arranged at the lower half of the lower housing assembly 3, and a transparent glass 34 is arranged at the window 35, and the scale mark 18 is arranged on the transparent glass 43. The lower housing assembly is provided with a positioning extension part 36 at the window 35, and the side of the transparent glass 34 is installed on the positioning extension part 36 and sealed and fixed.

[0039] In some embodiments, Fig. 9 and Fig.10 As shown, the lower shell assembly 3 includes an upper lower shell portion and a lower lower shell portion, the lower lower shell portion is a transparent shell to form the visual portion, and the lower lower shell portion is provided with the scale mark 18. A concave-convex plug-in structure is provided between the lower end surface of the upper lower shell portion and the upper end surface of the lower lower shell portion, and the structures are sealed and connected.

[0040] In order to further illustrate the present identification and judgment method, a certain model of compressor is taken as an example for detailed description.

[0041] The compressor displacement is determined by the compressor cylinder bore diameter and the crankshaft eccentric position to obtain an R600a compressor with a refrigeration capacity of 95W, as shown in the figure, and 2 / 3 to 3 / 4 is cut off from the stop plane of the compressor lower shell to form a lower shell cutting assembly with a height of 1 / 4 to 1 / 3 of the height of the main body lower shell. A support pin is welded at the bottom of the lower shell cutting assembly and a compression spring support block is installed on the support pin. The compression spring support block is installed with a compression spring. The pump body is placed on the compression spring and the pump body is kept level.

[0042] Alternatively, the pump body can be placed on a lower shell assembly made of fully transparent tempered glass, through which the crankshaft oil suction pipe in the pump body and the motor stator lower winding package can be observed.

[0043] Pour the refrigeration oil directly into the lower housing assembly, observe the oil level and the depth of the crankshaft oil suction pipe in the pump body, until the oil surface has immersed 1 / 2 to 2 / 3 of the lower winding package of the motor stator; gently pick up the pump body to observe whether the lower end ring of the rotor on the pump body is stained with oil, and ensure that there is no oil stain on the lower end ring of the rotor, and record the amount of oil poured in with a measuring cylinder. The amount of oil at this time can be approximately regarded as the oil storage amount V1 at the bottom of the lower housing, V1=55ml.

[0044] Pour the oil of V1 into the lower shell assembly, seal the upper shell assembly, fill the compressor with oil through the process pipe, and observe the oil level through the transparent tempered glass until the oil level is 2 / 3 to 3 / 4 of the height of the motor lower coil. At the same time, pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface, and record the amount of oil V poured into the compressor inner shell A =95ml.

[0045] The process pipe is sealed with a sealing joint, the suction pipe on the lower shell assembly is connected to the ventilation hose, the exhaust pipe is connected to the oil guide pipe, and the oil guide pipe is connected to the measuring cylinder; and the starter and protector are connected to the compressor sealing terminal, and the power cord is connected to the protector and the starter plug.

[0046] Power on the compressor, and introduce dry air or nitrogen from the suction pipe. The pressure of the introduced gas is 0.04-0.08 MPa. Power on for 2.5 hours, and record the volume V of the oil in the measuring cylinder after 2.5 hours of testing. b =5ml; at the same time, let the compressor stand for 6 to 10 minutes after power-on, and pour out the remaining oil V in the compressor c =50ml, then the oil volume V2 of each moving pair of the pump body, such as the clearance between the piston and the cylinder hole, the clearance between the connecting rod and the large and small holes, and the motor stator coil is: V2=V A -V b -V c =95-5-50=40ml.

[0047] Furthermore, a compressor with a cooling capacity of 95W was selected again. After the same pump body and motor were installed in place, the pump body including the motor was placed in the transparent shell, and the upper and lower shells were sealed. The compressor was filled with oil through the process pipe, and the oil level was observed through the transparent tempered glass until the oil level was 2 / 3 to 3 / 4 of the height of the motor lower wire package. At the same time, the pump body was picked up to ensure whether the lower end ring of the rotor was immersed in oil or soaked in oil, and to ensure that the lower end ring of the rotor did not touch the oil surface, and the amount of oil poured into the compressor inner shell V was recorded. A =105ml.

[0048] Connect the compressor to the refrigeration cycle system, evacuate the compressor, and fill it with an appropriate amount of refrigerant such as R600a. After the compressor is evacuated, the compressor is powered on and operated, the first charging valve 1 and the second charging valve are opened, and the two stop valves are closed. The refrigeration cycle system is allowed to run stably for 3 to 3.5 hours. After the test, pour the oil in the first oil separator and the second oil separator into a measuring cylinder and record the total oil volume V of the two oil separators. d =14ml.

[0049] Unscrew the thread at one end of the first charging valve, open the stop valve on the first oil reservoir, connect 0.8-1.0MPa nitrogen from the unscrewed end of the first charging valve, and use the high pressure of the nitrogen to blow the remaining oil at the high-pressure end of the refrigeration cycle system into the first oil reservoir; unscrew the thread at one end of the second charging valve, open the stop valve on the second oil reservoir, connect 0.8-1.0MPa nitrogen from the unscrewed end of the second charging valve, and use the high pressure of the nitrogen to blow the remaining oil at the low-pressure end of the refrigeration system into the second oil reservoir, and mix the oil products of the first oil reservoir and the second oil reservoir, heat them at 40-50°C for 5 minutes, and after heating, use a high-precision small measuring cylinder to record the total oil volume V of the first oil reservoir and the second oil reservoir. e ≈2ml; then the amount of oil discharged from the compressor to the refrigeration cycle system V3=V d +V e =14+2=16ml.

[0050] The total oil injection volume of the compressor V=V1+V2+V3=55+40+16=111ml, among which the circulating oil volume V3 discharged from the compressor to the refrigeration cycle system accounts for 14.4% of the total oil volume.

[0051] Furthermore, a R600a compressor with a cooling capacity of 165W is selected. According to the same method as above, V1=112ml, V2=45ml, and V3=27ml of this compressor can be obtained. Then the total oil volume of this 165W compressor is V=112+45+27=184ml, and its V3 circulating oil volume accounts for 14.6% of the total oil volume.

[0052] Furthermore, a R600a compressor with a cooling capacity of 200W is selected. According to the same method as above, V1=116ml, V2=50ml, and V3=31ml of this compressor can be obtained. Then the total oil volume of this 200W compressor is V=116+50+31=197ml, and its V3 circulating oil volume accounts for 15.7% of the total oil volume.

[0053] It can be determined that the oil content of each moving pair of a normal commercial refrigeration compressor, such as the clearance between the piston and the cylinder hole, the clearance between the connecting rod and the large and small holes, and the stator winding package of the motor, is about 40 to 50 ml, and the circulating oil volume discharged by the compressor into the refrigeration cycle system accounts for 14.4% to 15.7% of the total oil volume. If the test is higher than 15.7%, it indicates that the compressor V3 has increased, which may warn that the oil filling volume has increased. Then, the data obtained by this method can be used to adjust the oil filling volume so that the circulating oil volume of the oil product returns to the normal value. At the same time, the device and method can also intuitively find that the oil product has increased abnormally. After the oil volume increases, once the oil exceeds the lower end ring surface of the rotor, the compressor will have an obvious stirring sound when it is running after starting. The transparent shell in the device can also be used to find that the rotor produces stirring oil foam. Therefore, through the device and method, when the refrigeration oil filling volume is high, the oil suction pipe oil entry depth exceeds the optimal filling volume scale line position, and the oil volume is returned to the optimal filling volume scale line position by continuously pouring out the oil volume.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for identifying and judging the oil filling amount of a compressor, characterized in that: The identification and judgment method comprises the following steps: Obtain the oil volume at the bottom of the compressor lower shell, recorded as V1; Obtain the amount of oil contained in each moving pair of the pump body in the compressor and the stator winding of the motor, recorded as V2; Obtain the amount of oil discharged from the compressor into the refrigeration cycle system, recorded as V3; The total oil injection volume of the compressor is V, then V=V1+V2+V3.

2. The method for identifying and judging the oil injection amount of a compressor according to claim 1, characterized in that: The method for obtaining the oil storage volume V1 is as follows: make a visualized lower housing assembly, install the pump body and the motor in the lower housing assembly, and keep the pump body level; Pour the refrigeration oil into the lower housing assembly, and observe the oil level and the depth of the oil suction pipe of the crankshaft in the pump body until the oil level has penetrated 1 / 2 to 2 / 3 of the lower winding package of the motor stator; Pick up the pump body and observe whether the lower end ring of the rotor on the pump body is stained with oil, and ensure that there is no oil stain on the lower end ring of the rotor. Record the amount of oil poured in. The amount of oil at this time is the oil storage volume V1 at the bottom of the lower shell.

3. The method for identifying and judging the oil injection amount of a compressor according to claim 2, characterized in that: The lower shell component is made of transparent tempered glass, or the lower shell component is made according to the following method: Select a compressor lower shell, cut downward from the stop plane of the lower shell, cut off 2 / 3~3 / 4 and form a lower shell cutting component with a height of 1 / 4~1 / 3 of the original lower shell height.

4. The method for identifying and judging the oil injection amount of a compressor according to claim 1, characterized in that: The method for obtaining the oil volume V2 is as follows: making a visualized upper housing assembly and a lower housing assembly, installing a pump body and a motor in the upper housing assembly and the lower housing assembly according to assembly requirements, and obtaining an assembled compressor; Fill the compressor with oil through the process pipe on the lower housing assembly, and observe the oil level in real time until the oil level is 2 / 3 to 3 / 4 of the height of the lower stator winding of the motor. Pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface. Record the amount of oil added to the compressor V A ; The process pipe is blocked, the air intake pipe on the lower shell assembly is connected to the ventilation hose, the air exhaust pipe is connected to the oil introduction pipe, and the oil introduction pipe is connected to the measuring cylinder; Power on the compressor, introduce dry air or nitrogen from the suction pipe, and record the volume V of the oil in the measuring cylinder after a period of testing. b At the same time, let the compressor stand for 6 to 10 minutes after power-on, and pour out the remaining oil V in the compressor. c , then the oil volume V2=V A -V b -V c .

5. The method for identifying and judging the oil injection amount of a compressor according to claim 1, characterized in that: The method for obtaining the oil volume V3 is as follows: making a visualized upper housing assembly and a lower housing assembly, installing a pump body and a motor in the upper housing assembly and the lower housing assembly according to assembly requirements, and obtaining an assembled compressor; Fill the compressor with oil through the process pipe on the lower housing assembly, and observe the oil level in real time until the oil level is 2 / 3 to 3 / 4 of the height of the lower stator winding of the motor. Pick up the pump body to ensure that the lower end ring of the rotor is immersed in oil or soaked in oil, and ensure that the lower end ring of the rotor does not touch the oil surface. Record the amount of oil added to the compressor V A ; Connecting the compressor to a refrigeration cycle system, wherein the refrigeration cycle system is provided with an oil separator and an oil storage tank; The compressor is evacuated and filled with an appropriate amount of refrigerant. The compressor is powered on and the refrigeration system is allowed to run stably for several hours. After the operation is completed, the oil in the oil separator is poured into a measuring cylinder and the oil volume V in the oil separator is recorded. d ; Get the oil volume V in the oil reservoir e , then the oil volume V3=V d +V e .

6. The method for identifying and judging the oil injection amount of a compressor according to claim 5, characterized in that: The oil volume V in the oil reservoir e The method for obtaining is as follows: open the stop valve on the oil reservoir, use nitrogen to blow the oil remaining at the high-pressure end of the refrigeration cycle system into the oil reservoir; heat it at 40-50°C for several minutes, and after heating, record the oil volume V in the oil reservoir. e .

7. The method for identifying and judging the oil injection amount of a compressor according to claim 1, characterized in that: The refrigeration cycle system includes a compressor, a first oil separator, a condenser, a filter, a throttling device, an evaporator and a second oil separator which are connected in sequence; a first oil reservoir with a shut-off valve is provided between the first oil separator and the condenser, and a second oil reservoir with a shut-off valve is provided between the second oil separator and the evaporator; a first charging valve is provided between the filter and the condenser, and a second charging valve is provided between the throttling device and the evaporator.

8. The method for identifying and judging the oil injection amount of a compressor according to claim 1, characterized in that: After connecting the compressor to the refrigeration cycle system, and placing the refrigeration cycle system in a constant temperature environment, evacuate the compressor. After the evacuation is completed, fill the compressor with a proper amount of refrigerant, power on the compressor and observe the crankshaft oil stirring in the pump body; if bubbles continue to emerge from the oil surface, and the bubbles do not disappear or even increase in size, it means that the anti-foaming performance of the compressor oil is unqualified, and the compressor is at risk of lubrication difficulties and poor sealing; if no bubbles appear or the bubbles are small in size, and the bubbles burst after bubbling, it means that the anti-foaming performance of the compressor is qualified, the oil filling amount of the compressor is also qualified, and the lubrication and sealing requirements of the compressor are met.

9. A compressor oil filling amount identification structure, characterized in that: A visualization part is provided on the compressor housing, and a pump body and a motor are provided in the compressor housing. An oil suction pipe is provided at the lower end of the crankshaft in the pump body, and the oil suction pipe is connected to the refrigeration oil. The visualization part can observe the depth of the oil suction pipe inserted into the refrigeration oil and the oil level height.

10. The compressor oil filling amount identification structure according to claim 9, characterized in that: The compressor housing includes an upper housing component and a lower housing component assembled together, the visualization part is a transparent glass arranged on the lower half of the lower housing component, or the upper housing component and the lower housing component are both made of transparent materials; the visualization part is also provided with a scale mark.

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